My pregnant guppy fish is three and a half weeks (I think) into her pregnancy and she's hanging around the top corner of the tank, moving slowly and there was some white-ish stuff coming out where I think she's going to give birth, but it went back in. She's also 'breathing' fast. Her belly is parallel to her back, so I suppose that's a boxy shape. How soon is she going to give birth and when do I put her in the breeder box?